Improvement in furnaces for steam-boilers



inwind what Monsun.' TAYLOR, or UNITED STAT-ns anni'.

Letters Patent No. 111,154, dated January 2 4, 1871.

IMPRovEMENT mi-'uRNAcEs Fon sTEAM-eonERs.

Thecheduler'referre to in these Letters Patent and making part of the same.

To whom it may' concern Be it known that I, Molise K. TAYLOR, Captain` 'and Assistant Surgeon United States Army, have invented a new and useful Improvement in a Furnace for Steam-Boilers; andI do declare that the follow-2 ing is a true and accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereonand being a part `of this specification, in`xvhich Figure 1 is a front elevation of my improved furnace, partially in section.

Figure 2 isla vertical longitudinal section of the same. y

Figure 3 is aplan of a pair of my lower or dump ing grates.V Figure 4 is an elevation of the front end of one sectiouof a dumping-grate.

Figure 5 is a cross-section of the same.

" Figure 6, sheet 2, is an elevation of the grate-dulnp.-

ing mechanism, as when lthe gratesare opened.

Figure 7 is a similar view of the same when closed" and locked.

Figure 8 'is a plan of the parts sliown in iig. 7. The nature 'of this inventionrelates to an improved fnrnace, more particularly designed for malrineand. stationary steam-boilers, to secure perfect combustion of bituminous coal therein, although other fuels may be used, and with great advantage.

The invention consists in the arrangement, within the re-box of 4a boiler, of two sets of grates, the one above the other, to which accessf is had throughsuitble doors, and in theash-pit an inclined sifting-grate. The lower grates are hung in pairs, and, by a peculiar system of' coupling-levers, are arranged to dump the coals thereon down on'the sifting-grate. In ring with soft coals, as soonas their volatile matters are thrown off and they become more or 'less coked, they are dumped ou the sifting-gratq'sliding down to the front, whence 'they are shoveled Yup onto the upper grates, the ash and cliukers being eliminated by the sifting-gratos. Fresh fuelis then supplied to the .lowerI grates, and as the smoke and gases of com- `bustion are thrown off, they are compelled to pass through the incadescent fuel on theupper gratos on their yway to the lues, which causes-them. to ignite and be entirely consumed, thereby utilizingthe entire' ','volatle and combustible matter contained in the fuel,

` still greater economy in the consumption of fuel.

In thel drawingi s A represents the body or shell of a vmarine boiler, of which Bare the direct and G the return-dues.

D are the front water legs, D the rear ones, vand DZ the water bottom under the ash-pit, forming a furnace 0r fire-box of the kind generally constructed for `such boilers, except that the ash-pit isa little deeper. E are hollow orwater-grates, each one being constructed of boiler-plates of the formshown in section in fig. 1, and in a boilerof eight vfeet front should be about -two and a quarter inches wide at the top, and

oneinch at the bottom, and six inchesdeep. These gratos connect the b ack sheet with -the front leg of the iiresbox, being set in at an inclination toward the lfront, as shown in fig..2. The gratesare set about Y Gare other grates, in sections of several-'bars cast in one fram'e section, the bars being arranged at the usual distance apart, about one inch, and the gratesections beingarranged and. operated in pairs, as will polygonal end, which is inserted in a corresponding .socket in the front end of the section, where-it is secured by a key, c.

Hare doors through which fuel is supplied to these lower grate's. l

`The outer projecting end of each of the rock-shafts is provided with a crank-head, d, thoseof each pair of sections being 'so varranged and connected that, by means of a hand-lever, e, inserted in a socket of" one of them, they may befmade to open 4downwardly andv dump their fuel, and by the same means brought up again to a horizontal plane, and 'locked together in that position by means of a hook-latch, j, pivoted in the coupling-bar, g, engaging with a stud 'in the head which is operated upon.

The sides of the grate-sections are provided with sel-rations 7i., which interlock with those of'the adjoining ones so that, when closing, any lumps of coal lodging there may-be out up'aud di'op out of the way of their closing. v

I is`an inclined sifting-grate, supported at the rear end ofthe ash-pit. The grate may be made in sections of any convenient width, and hinged either at the rear end or at convenient point in its length, so

Vthat it may be lifted up to remove the ashes and elinkers accumulating underneath it. Og, it' preferred,

vsuitable openings made in the sides of the ash-pit will answer; the purpose.

J are doors in the ash-pit front, whichA give access to the sifting-grate.

The re is started on :bother on the lower grate only. As soon as the coals on the lower grates have thrown oli` their volatile matter and become more or less coked, the firemen commence at one side of the furnace and dump the contents of each pair of grates onto the sifting-grates below, and then close the sections again. As .the coals slide to the front of the grate the ashes and clinkel's will sift through. The coals thus cleansed are then shoveled up into the upper part of the furnace, on the grates E, and fresh fuel supplied to the lower sections. As the gases of combustion vare thrown oil` from the fresh coals they are compelled to pass up through the incandescent fuel on the upper grate, which insures their ignition and total combustion. The process of dumping and refilling the lower gratos and shoveling up the coked coals to the upper grate is continued until all the sections are thus treated.

AThe grate surface of the boiler-furnace is, by the employment of the water-grate described, treb1ed, and a greater amount of heat utilized, while it promotes rapid circulation ofthe water I taking its Water, as it does, fromv near the bridge wall, the high temperature of the water tends to prevent deposits of scale and earthy matters therein.

Nor is this construction of boiler-furnace an advantage to the use of soft coal alone,.as it may be used stantially as described and shown, for the purposes' set forth.

2. The dumping-grates G, in combination with the studs a, rock-shafts b, heads j, levers d, coupling-rods g, and latchesf, all constructed and arranged substanially as described and shown, for the purposes set orth. a

MORSE K. TAYLOR.

Witnesses:

FREDERICK EBERTS, Gno. Sermon. 1 

